Transparent Conductive Film Parallel Cathode for AMOLED Brightness Uniformity
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Solution Overview
Problem
Active-Matrix Organic Light-Emitting Diode (AMOLED) display panels face challenges in achieving high brightness uniformity, which is crucial for user experience.
Innovation Solution
A display panel structure comprising a base substrate, a pixel definition layer, a cathode layer, and a transparent electrically-conductive film, where the transparent film is electrically connected to the cathode layer in parallel, optionally with a polarizing sheet and protecting layer, to reduce cathode resistance and improve brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional cathode layer structure is used, then the device complexity is low, but the brightness uniformity is poor due to high cathode resistance and voltage drop
Solution Approach 1:
The cathode structure is segmented into two separate conductive layers: a cathode layer and a transparent electrically-conductive film layer. This segmentation allows each layer to perform its specific function independently, with the transparent film providing additional current distribution to improve brightness uniformity without interfering with the cathode's primary emission function.
Solution Approach 2:
The transparent electrically-conductive film serves multiple functions: it acts as an additional current distribution path to reduce voltage drop, maintains optical transparency for light output, and provides electrical connection when connected to the cathode layer through through-holes in the polarizing sheet. This multi-functionality addresses brightness uniformity without sacrificing other performance aspects.
2Manufacturing precision
If the transparent electrically-conductive film is electrically connected to the cathode layer, then the brightness uniformity is improved, but the manufacturing process complexity increases
Solution Approach 1:
The transparent electrically-conductive film is formed on the pixel definition layer before the cathode layer is deposited. This preliminary positioning allows the film to be pre-aligned with the pixel regions, and subsequent through-hole formation in the polarizing sheet establishes electrical connections without requiring complex post-processing alignment steps.
Solution Approach 2:
The polarizing sheet with through-holes serves as an intermediary structure that enables electrical connection between the transparent electrically-conductive film and the cathode layer. The through-holes provide direct conductive paths while the polarizing sheet itself maintains the display's optical properties, simplifying the connection process compared to direct film-to-film bonding.
3Ease of manufacture
If projections of through-holes overlap with pixel projections, then the electrical connection is straightforward, but the display quality deteriorates due to potential defects in pixel regions
Solution Approach 1:
The through-holes are strategically positioned in non-pixel regions of the polarizing sheet, creating local differentiation in the structure. This ensures that the electrical connection paths are established in areas that do not interfere with the pixel emission regions, maintaining high display quality while achieving effective electrical connection between the conductive layers.
Data Source
AI summary
The disclosure relates to the field of display technologies, and discloses a display panel and a method for fabricating the same, and the display panel includes: a base substrate, a pixel definition layer and a cathode layer arranged on one side of the base substrate successively, and a transparent electrically-conductive film arranged on the side of the cathode layer away from the base substrate, wherein the transparent electrically-conductive film is electrically connected with the cathode layer so that the transparent electrically-conductive film is in parallel to the cathode layer.